Kepler-107 e
Kepler-107 e is a super-Earth orbiting Kepler-107 in the constellation Cygnus. It lies about 1,716 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-107 e?
Kepler-107 e has a radius of 2.90 times that of Earth. Its mass is 14.1 times that of Earth, giving it a density of 3.18 g/cm³ — between that of rocky and gaseous planets.
Is Kepler-107 e in the Habitable Zone?
Kepler-107 e orbits inside the inner edge of the habitable zone of Kepler-107. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-107: 1.110–2.609 AU (conservative: 1.405–2.474 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-107 e
The equilibrium temperature of Kepler-107 e is about 955 K (682 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 139 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-107 e — one full orbit around Kepler-107 — lasts 14.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.126 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.10).
How Was Kepler-107 e Discovered?
Kepler-107 e was discovered in 2014 using the transit method, with observations from Kepler.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is Kepler-107 e?
Kepler-107 e is 1,715.6 light-years (526.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,716 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 30,194,560 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. Kepler-107 e scores 0.22, ranking #3,625 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-107
Kepler-107
- Surface temperature
- 5,854 K (Sun: 5,772 K)
- Mass
- 1.24 M☉
- Radius
- 1.45 R☉
- Age
- 4.3 billion years (Sun: 4.6)
The Kepler-107 Planetary System
Kepler-107 e is one of 4 known planets in the Kepler-107 system. Its siblings:
- Kepler-107 b (Lava World)
- Kepler-107 c (Super Earth)
- Kepler-107 d (Terrestrial)
Kepler-107 e — Complete Data
| Radius | 2.903 Earth radii (0.259 Jupiter radii) |
|---|---|
| Mass | 14.10 Earth masses (0.044 Jupiter masses) |
| Density | 3.18 g/cm³ (Earth: 5.51) |
| Orbital period | 14.75 days |
| Orbital distance | 0.126 AU |
| Eccentricity | 0.100 |
| Equilibrium temperature | 955 K (682 °C) |
| Stellar irradiation | 138.70× Earth |
| Earth Similarity Index | 0.22 |
| Distance from Earth | 1,715.6 light-years (526.0 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2023-04-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-107 e
Is Kepler-107 e habitable?
No — Kepler-107 e orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-107 e?
Kepler-107 e is about 1,716 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 30,194,560 years to get there.
How big is Kepler-107 e compared to Earth?
Kepler-107 e has 2.90 times the radius of Earth and about 14.1 times its mass.
How long is a year on Kepler-107 e?
One orbit around Kepler-107 takes 14.7 Earth days — short enough that 25 of its years would fit into one Earth year.
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